Commit | Line | Data |
---|---|---|
965dc5fc | 1 | /* |
948e78c3 | 2 | * Driver for GE FPGA based GPIO |
965dc5fc | 3 | * |
948e78c3 | 4 | * Author: Martyn Welch <martyn.welch@ge.com> |
965dc5fc | 5 | * |
948e78c3 | 6 | * 2008 (c) GE Intelligent Platforms Embedded Systems, Inc. |
965dc5fc MW |
7 | * |
8 | * This file is licensed under the terms of the GNU General Public License | |
9 | * version 2. This program is licensed "as is" without any warranty of any | |
10 | * kind, whether express or implied. | |
11 | */ | |
12 | ||
13 | /* TODO | |
14 | * | |
15 | * Configuration of output modes (totem-pole/open-drain) | |
16 | * Interrupt configuration - interrupts are always generated the FPGA relies on | |
6518bb69 | 17 | * the I/O interrupt controllers mask to stop them propergating |
965dc5fc MW |
18 | */ |
19 | ||
20 | #include <linux/kernel.h> | |
965dc5fc | 21 | #include <linux/io.h> |
a0b66e3f | 22 | #include <linux/slab.h> |
965dc5fc | 23 | #include <linux/of_device.h> |
965dc5fc | 24 | #include <linux/of_gpio.h> |
866010fb | 25 | #include <linux/of_address.h> |
7dfe293c | 26 | #include <linux/module.h> |
866010fb | 27 | #include <linux/basic_mmio_gpio.h> |
965dc5fc MW |
28 | |
29 | #define GEF_GPIO_DIRECT 0x00 | |
30 | #define GEF_GPIO_IN 0x04 | |
31 | #define GEF_GPIO_OUT 0x08 | |
32 | #define GEF_GPIO_TRIG 0x0C | |
33 | #define GEF_GPIO_POLAR_A 0x10 | |
34 | #define GEF_GPIO_POLAR_B 0x14 | |
35 | #define GEF_GPIO_INT_STAT 0x18 | |
36 | #define GEF_GPIO_OVERRUN 0x1C | |
37 | #define GEF_GPIO_MODE 0x20 | |
38 | ||
9dacc6de AS |
39 | static const struct of_device_id gef_gpio_ids[] = { |
40 | { | |
41 | .compatible = "gef,sbc610-gpio", | |
42 | .data = (void *)19, | |
43 | }, { | |
44 | .compatible = "gef,sbc310-gpio", | |
45 | .data = (void *)6, | |
46 | }, { | |
47 | .compatible = "ge,imp3a-gpio", | |
48 | .data = (void *)16, | |
49 | }, | |
50 | { } | |
51 | }; | |
52 | MODULE_DEVICE_TABLE(of, gef_gpio_ids); | |
965dc5fc | 53 | |
9dacc6de | 54 | static int __init gef_gpio_probe(struct platform_device *pdev) |
965dc5fc | 55 | { |
9dacc6de AS |
56 | const struct of_device_id *of_id = |
57 | of_match_device(gef_gpio_ids, &pdev->dev); | |
866010fb KP |
58 | struct bgpio_chip *bgc; |
59 | void __iomem *regs; | |
60 | int ret; | |
9dacc6de | 61 | |
866010fb KP |
62 | bgc = devm_kzalloc(&pdev->dev, sizeof(*bgc), GFP_KERNEL); |
63 | if (!bgc) | |
9dacc6de AS |
64 | return -ENOMEM; |
65 | ||
866010fb KP |
66 | regs = of_iomap(pdev->dev.of_node, 0); |
67 | if (!regs) | |
68 | return -ENOMEM; | |
69 | ||
70 | ret = bgpio_init(bgc, &pdev->dev, 4, regs + GEF_GPIO_IN, | |
71 | regs + GEF_GPIO_OUT, NULL, NULL, | |
72 | regs + GEF_GPIO_DIRECT, BGPIOF_BIG_ENDIAN_BYTE_ORDER); | |
73 | if (ret) { | |
74 | dev_err(&pdev->dev, "bgpio_init failed\n"); | |
75 | goto err0; | |
76 | } | |
77 | ||
9dacc6de | 78 | /* Setup pointers to chip functions */ |
74b18de9 AL |
79 | bgc->gc.label = devm_kstrdup(&pdev->dev, pdev->dev.of_node->full_name, |
80 | GFP_KERNEL); | |
81 | if (!bgc->gc.label) { | |
82 | ret = -ENOMEM; | |
866010fb | 83 | goto err0; |
74b18de9 | 84 | } |
866010fb KP |
85 | |
86 | bgc->gc.base = -1; | |
87 | bgc->gc.ngpio = (u16)(uintptr_t)of_id->data; | |
88 | bgc->gc.of_gpio_n_cells = 2; | |
89 | bgc->gc.of_node = pdev->dev.of_node; | |
9dacc6de AS |
90 | |
91 | /* This function adds a memory mapped GPIO chip */ | |
866010fb KP |
92 | ret = gpiochip_add(&bgc->gc); |
93 | if (ret) | |
74b18de9 | 94 | goto err0; |
866010fb KP |
95 | |
96 | return 0; | |
866010fb KP |
97 | err0: |
98 | iounmap(regs); | |
99 | pr_err("%s: GPIO chip registration failed\n", | |
100 | pdev->dev.of_node->full_name); | |
101 | return ret; | |
9dacc6de | 102 | }; |
e041013a | 103 | |
9dacc6de AS |
104 | static struct platform_driver gef_gpio_driver = { |
105 | .driver = { | |
106 | .name = "gef-gpio", | |
9dacc6de AS |
107 | .of_match_table = gef_gpio_ids, |
108 | }, | |
965dc5fc | 109 | }; |
9dacc6de | 110 | module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe); |
965dc5fc | 111 | |
948e78c3 MW |
112 | MODULE_DESCRIPTION("GE I/O FPGA GPIO driver"); |
113 | MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com"); | |
965dc5fc | 114 | MODULE_LICENSE("GPL"); |